Charging Slateback is a common Creature — Beast card from Onslaught (ONS), collector number 194. Current market price: $0.06 (foil $0.46), TCGplayer market prices via Scryfall.
This creature can't block. Morph {4}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)